<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input type="password" v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data () {
        return {
            // 表单数据绑定
            loginForm: {
                username: '',
                password: ''
            },
            // 表单规则验证
            loginFormRules: {
                username: [
                    { required: true, message: '请输入用户名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 16, message: '长度在 6 到 16 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods: {
        // 点击重置按钮
        resetLoginForm () {
            // console.log(this)
            this.$refs.loginFormRef.resetFields()
        },
        // 点击登录按钮表单域验证
        login () {
            this.$refs.loginFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post('login', this.loginForm)
                if (res.meta.status !== 200) return this.$message.error('登录失败')
                this.$message.success('登录成功')
                // 1.将登陆成功之后的token,保存到客户端的sessionStorage中
                // 1.1 项目中除了登录之外的其它API接口，必须在登陆之后才能访问
                // 1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
                window.sessionStorage.setItem('token', res.data.token)
                // 2.通过编程时导航跳转到后台主页，路由地址时 /home
                this.$router.push('/home')
            })
        }
    }
}
</script>

<style lang="less" scoped>
    .login_container{
        background-color: #2b4b6b;
        height: 100%;
    }
    .login_box{
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        .avatar_box {
            height: 130px;
            width: 130px;
            border: 1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #ddd;
            position: absolute;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: #fff;
            img {
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }
    }
    .login_form{
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
    .btns{
        display: flex;
        justify-content: flex-end;
    }
</style>
